Photoflash lamp



Jan. 29, 1946.

P. SCHWARZE PHOTOFLASH LAMP Filed April 19, 1940 Patented Jan. 29, 1946UNITED STATES PATENT OFFICE Application April 19, 1940, Serial No.330,451 In Germany May 6, 1 939 's claims (o1. svp- 31) The inventionrelates to photoflash lamps of the type in which the illuminating effectis produced by the reaction of substances inside enclosed containers.The object of the invention is to provide a photoash lamp of highilluminating power and relatively small size which is so constructed asto eliminate all'danger of explosions.

I attain this object by sealing the vessel containing the flashlightsubstances by a lid with the aid of a sealing compound in such a waythat it can be separated from the container by the pressure of reactionand by providing another closure f cations of the photoash lampaccording to the invention. In Fig. 1, I isa glass tube which containsthe reacting substances, e. g. magnesium wire and oxygen gas, thelatter-1 preferably at atmospheric or higher pressure. 'I'he tube issealed below by the iiexible lid 2, e. g. of thin sheet metal, with theaid of the gas-tight and preferably soft sealing compound 9. Before thetube is sealed, the lid 2 lies loose upon the shoulder 4 of the closuremember 3. Between the latter and the lid 2 there is a space 5 which maycommunicate with the outer air or be filled with gas. A screw base 6 isfttd on the under side yof the closure member 3. An electrode is xed tothe lid 2,

closure member 3, the soft sealing compound is applied to the rim of thelid 2 and the glass tube I is pressed in. In order to obtain a moredurable mounting of the closure member 3 to the tube I, the lower partof the latter and the upper part of the closure member 3 may bethreaded, as shown in Fig. 5, so that they can'be screwed together. Orthese two parts may be permanently connected by using a hard cement.Upon assembly, the lid 2 lies iirmly in position, but when the reactionpressure arises it may be presseddownwardiy in the manner indicated bythe dotted' line, in which process it is able to detach itself bysagging from the bearing surface 4, after overcoming the resistanceprovided by the sealing compound. The glass tube maybe filled withoxygen through an aperture which after iilling has to be sealedin agas-tight manner, or the lling may be effected by an injection beforethe parts I and 3 are put. together. The closure member 3 may beconstructed as or supplied with a standard electric lamp base. r

In Fig. 2 the vessel consists of the bell-shaped glass body I which issealed by the lid 2. The former has on its rim a laterally extendingnose 8 which is engaged by the ring 1. The upper rim of the latter may,after the glass body has been pressed into the sealing compound, beturned over the nose 8. The lower portion of the electrode leadingthrough the lid 2 may consist of fuse .wire, for use of the photofiashlamp on power current. In Fig. 3 the glass bulb has a ange 8 at thelower end and is joined to the closure member 3 by turning the upperrim4 of the latter over the flange. In this embodiment the socket 6 isxed to the lid 2 instead of to the closure member 3, and the latter istherefore 4provided with a central aperture through which the socketextends. Fig. 4 shows a further embodiment in which the lid and theclosure member are united in one piece by providing the lid 2 withlateral extensions 1 which are turned over the flange 8 of the glassbulb in such a way that a small space is left above the fiange,lbetweenit and the turned over extensions, thereby allowing the united sealingpart to become separated from the glass bulb to a small extent.

What I claim is:

1. A photoash lamp comprising a container; substances inthe containerwhich produce light by reaction; means' inside the container forigniting said substances; a lid sealed to an opening of 'v saidcontainer with the aid of'a sealing cornpound, said lid being mounted insuch a way that it can be separated from said container by the pressureof reaction, whereby the resistance offered by said sealing compound isovercome, and a closure member xed to said container and adapted to holdsaid lid when the latter `is sepai rated from the container.

by reaction; means inside the container for igniting saidsubstances; alid sealed to an opening of` said container with the aid of a sealingcompound, said lid being mounted in such a way that it can be separatedfrom said container in consequence of the reaction pressure byovercoming the resistance oiered by said sealing compound; a closuremember xed to said container and adapted to hold said lid when itbecomes detached from the reaction; and a closure member xed to saidcontainer and adapted to hold saidlid when it becomes detached from thecontainer.

4. A photoash lamp comprising a container; substances withinthecontainer which produce light by reaction; means inside the containerfor igniting said substances; a lid sealed to an opening of saidcontainer with the aid of a sealing compound, said lid being mounted insuch a way that it can be separated from the container by the reactionpressure. whereby the resistance oiered by said sealing compound isovercome; and a. closure member xed to said container and adapted tohold said lid when it becomes detached fromthe container, said closuremember being constructed as a. lamp base for insertion into electricholders.

5.A A photofiash lamp comprising a glass bulb; substances within saidbulb which produce light by reaction; a lid sealed to an opening of saidbulb and having a lamp base for insertion into electric holders, saidlid being mounted in such a way that it can be separated from saidcontainer by the reaction pressure; and a closure member .detached fromsaid container by the pressure of' y linto electric holders.

fixed to said bulb and adapted to hold said lid when it is separatedfrom the bulb, said closure member having an aperture for said lampbase.

6.l A photoflash lamp comprising a glass tube provided at its open endwith a screw thread; substances in said tube which produce light byreaction; a lid sealed detachably to the open end of said tube; and aclosure member having a thread corresponding to that of said Atube andbeing screwed upon it, said closure member being adapted to hold saidlid when i't is detached from said container by the pressure ofreaction.

7. A photoflash lamp comprising a container fitted with a lateral ilangeat its opening; substancesin said container which produce light byreaction; a -lid sealed detachably to the opening of said container;and-a closure member xed to said container byturningits rim over saidilange, said closure member being adapted to hold said lid when thelatter is separated from said container by the pressure of reaction.

8. A photofiash lamp comprising a bulb transparent to light rays; alateral flange at the opening of said bulb; substances in said bulbwhich produce light by reaction; means for igniting said substances; aclosure member sealed detachably to the opening of said bulb; lateralextensionsto said closure member which are turned over said flange insuch a way that a space is left between the latter and the turned overextensions; and a lamp base at said closure member for insertion PAULSCHWARZE.

